Passive infrared intrusion detector unit



FIG. 1 is a perspective view of a passive infrared intrusion detector unit showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a side elevational view thereof; and

FIG. 5 is a front elevational view thereof. 

The ornamental design for a passive infrared intrusion detector unit, as shown. 